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Since these systems do not work by exchanging ions, like traditional water softeners do, one benefit claimed for the user is the elimination of the need to add salt to the system. Such systems do not remove minerals from the water itself. Rather, they can only alter the downstream effects that the mineral-bearing water would otherwise have.
Water high in mineral content (hard water) will leave mineral deposits on the pads and interior of the cooler. Depending on the type and concentration of minerals, possible safety hazards during the replacement and waste removal of the pads could be present. Bleed-off and refill (purge pump) systems can reduce but not eliminate this problem.
Furnace (central heating): a furnace, or a heater or boiler, used to generate heat for buildings; Boiler, used to heat water; also called a furnace in American English when used for heating and hot water in a building; Jetstream furnace or Tempest boiler, a design of wood-fired water heater